eglibc.inc: Remove quotation marks from OPTION_EGLIBC_NSSWITCH_FIXED_*

eglibc.inc: Remove quotation marks from OPTION_EGLIBC_NSSWITCH_FIXED_*

Kconfig outputs strings with quotation marks. When eglibc tries to see if
the paths exists, uses wildcard make function which doesn't strip out the
quotation marks - checking for path fails. So strip out the quotation
marks from OPTION_EGLIBC_NSSWITCH_FIXED_* option-groups.config.
(see nss/Makefile)

(From OE-Core rev: eacf0f3ed15eccb52eb6b98e20b75f0aa26b6e81)

Signed-off-by: Andrei Gherzan <andrei.gherzan@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>